The reluctance of some manufactures to recommend a brake fluid flush every 2 years is an error.IMHO. This is a case of when following the manufactures instructions are not in your best interest. Brake fluid is hydroscopic (it absorbs water) I dont need Toyota to tell me that water in my brake fluid is OK. BMW has been requiring brake fluid flushes every 2 years for at least the past 25 years. I have very infrequently had to preform repairs on the hydraulic part of the BMW brake system.Water free brake fluid will give better brake system performance. Replacing brake fluid is not a myth.But they sure did try to beat you up on the price. Takes 20min. tops. What ever happened with silicon brake fluid?